Related Party Transactions	12 Months Ended
Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Note 15. Related Party Transactions Janice Dyson, wife of John McAfee, the Company’s former Chief Cybersecurity Visionary, is the sole director of Future Tense Secure Systems, Inc. (“FTS”) and owns 33% of the outstanding common shares of FTS. On March 3, 2017, the Company purchased from FTS its 46% ownership interest Demonsaw for 2,000,000 shares of MGT common stock. The Company recorded the purchase using the fair value of the common shares provided of $2,500 and immediately impaired the equity method investment during the three months ended March 31, 2017. On May 9, 2016, the Company entered a consulting agreement with FTS, pursuant to which FTS would provide advice, consultation, information and services to the Company including assistance with executive management, business and product development and potential acquisitions or related transactions. During the years ended December 31, 2017 and 2016, the Company recorded consulting fees of $360 and $902, respectively, to FTS for such services. As of December 31, 2017, the Company owed $100 to FTS. *Demonsaw Transaction* On May 9, 2016, MGT entered into an asset purchase agreement to acquire certain assets owned by D–Vasive, Inc., a company in the business of developing and marketing certain privacy and anti–spy applications (the “D-Vasive APA”). Pursuant to the terms of the agreement, the Company would purchase assets including applications for use on mobile devices, intellectual property, customer lists, databases, project files and licenses. The proposed purchase price for D–Vasive was $300 in cash and 23.8 million shares of MGT common stock. On May 26, 2016, the Company agreed to acquire certain technology and assets of Demonsaw, a company in the business of developing and marketing secure and anonymous information sharing applications. Pursuant to the terms of this agreement, the Company would purchase assets including the source code for the Demonsaw solution, intellectual property, customer lists, databases, project files and licenses. The proposed purchase price for Demonsaw was 20.0 million shares of MGT common stock. On July 7, 2016, and prior to the closing of either of the above transactions, the Company and Demonsaw terminated their agreement. Simultaneously, D–Vasive entered an agreement with the holders of Demonsaw’s outstanding membership interests, whereby D–Vasive would purchase all such membership interests. Accordingly, the proposed purchase price for D–Vasive (inclusive of the Demonsaw assets) was increased to 43.8 million shares of MGT common stock. Both D-Vasive and Demonsaw were partly owned by FTS, an entity controlled by the wife of cybersecurity pioneer John McAfee, and as part of the acquisition, Mr. McAfee would become Chairman and Chief Executive Officer of MGT. On August 8, 2016, the Company filed a Definitive Proxy Statement to solicit, among other things, shareholder approval of the D–Vasive acquisition, at the Annual Meeting of Stockholders. On September 8, 2016, shareholder approval was obtained. However, on September 19, 2016, the New York Stock Exchange (the “Exchange”) informed the Company that it would not approve for listing on the Exchange the 43.8 million shares required to be issued to complete the closing of the D–Vasive acquisition. Not obtaining this critical closing condition resulted in the termination of the acquisition. In March 2017, MGT purchased 46% of the outstanding membership interests of Demonsaw from FTS for 2.0 million shares of MGT common stock. The Company recorded the purchase using the fair value of the common shares provided and immediately impaired the equity method investment during the three months ended March 31, 2017. On April 3, 2017 the Company terminated the D–Vasive APA dated May 9, 2016, as amended on July 7, 2016, entered into by and among MGT, D–Vasive, the shareholders of D–Vasive and MGT Cybersecurity. The termination of the D–Vasive APA was premised on Section 3.4(b) of the D–Vasive APA which states that the D–Vasive APA may be terminated by either party thereto if the closing contemplated thereunder did not occur on or before a specified date and the same is not otherwise extended by the parties, in writing or otherwise. Pursuant to the D–Vasive APA, as amended, MGT would have acquired certain technology and assets of D–Vasive if the closing had occurred on the terms of the D–Vasive APA, as amended.

Related Party Transactions

12 Months Ended

Dec. 31, 2017

Note 15. Related Party Transactions

Janice Dyson, wife of John McAfee, the Company’s former Chief Cybersecurity Visionary, is the sole director of Future Tense Secure Systems, Inc. (“FTS”) and owns 33% of the outstanding common shares of FTS. On March 3, 2017, the Company purchased from FTS its 46% ownership interest Demonsaw for 2,000,000 shares of MGT common stock. The Company recorded the purchase using the fair value of the common shares provided of $2,500 and immediately impaired the equity method investment during the three months ended March 31, 2017.

On May 9, 2016, the Company entered a consulting agreement with FTS, pursuant to which FTS would provide advice, consultation, information and services to the Company including assistance with executive management, business and product development and potential acquisitions or related transactions. During the years ended December 31, 2017 and 2016, the Company recorded consulting fees of $360 and $902, respectively, to FTS for such services. As of December 31, 2017, the Company owed $100 to FTS.

Demonsaw Transaction

On May 9, 2016, MGT entered into an asset purchase agreement to acquire certain assets owned by D–Vasive, Inc., a company in the business of developing and marketing certain privacy and anti–spy applications (the “D-Vasive APA”). Pursuant to the terms of the agreement, the Company would purchase assets including applications for use on mobile devices, intellectual property, customer lists, databases, project files and licenses. The proposed purchase price for D–Vasive was $300 in cash and 23.8 million shares of MGT common stock.

On May 26, 2016, the Company agreed to acquire certain technology and assets of Demonsaw, a company in the business of developing and marketing secure and anonymous information sharing applications. Pursuant to the terms of this agreement, the Company would purchase assets including the source code for the Demonsaw solution, intellectual property, customer lists, databases, project files and licenses. The proposed purchase price for Demonsaw was 20.0 million shares of MGT common stock.

On July 7, 2016, and prior to the closing of either of the above transactions, the Company and Demonsaw terminated their agreement. Simultaneously, D–Vasive entered an agreement with the holders of Demonsaw’s outstanding membership interests, whereby D–Vasive would purchase all such membership interests. Accordingly, the proposed purchase price for D–Vasive (inclusive of the Demonsaw assets) was increased to 43.8 million shares of MGT common stock.

Both D-Vasive and Demonsaw were partly owned by FTS, an entity controlled by the wife of cybersecurity pioneer John McAfee, and as part of the acquisition, Mr. McAfee would become Chairman and Chief Executive Officer of MGT.

On August 8, 2016, the Company filed a Definitive Proxy Statement to solicit, among other things, shareholder approval of the D–Vasive acquisition, at the Annual Meeting of Stockholders. On September 8, 2016, shareholder approval was obtained. However, on September 19, 2016, the New York Stock Exchange (the “Exchange”) informed the Company that it would not approve for listing on the Exchange the 43.8 million shares required to be issued to complete the closing of the D–Vasive acquisition. Not obtaining this critical closing condition resulted in the termination of the acquisition.

In March 2017, MGT purchased 46% of the outstanding membership interests of Demonsaw from FTS for 2.0 million shares of MGT common stock. The Company recorded the purchase using the fair value of the common shares provided and immediately impaired the equity method investment during the three months ended March 31, 2017.

On April 3, 2017 the Company terminated the D–Vasive APA dated May 9, 2016, as amended on July 7, 2016, entered into by and among MGT, D–Vasive, the shareholders of D–Vasive and MGT Cybersecurity. The termination of the D–Vasive APA was premised on Section 3.4(b) of the D–Vasive APA which states that the D–Vasive APA may be terminated by either party thereto if the closing contemplated thereunder did not occur on or before a specified date and the same is not otherwise extended by the parties, in writing or otherwise. Pursuant to the D–Vasive APA, as amended, MGT would have acquired certain technology and assets of D–Vasive if the closing had occurred on the terms of the D–Vasive APA, as amended.